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CVE-2026-48121— @langchain/langgraph-checkpoint-mongodb: NoSQL parameter injection in MongoDBSaver allows cross-tenant state access

Quick assessment

Affected
langchain-ai langgraphjs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangChain LangGraph是LangChain公司开源的一个大模型框架。 LangChain LangGraph 1.3.0及之前版本存在输入验证错误漏洞，该漏洞源于未对config.configurable中的检查点标识符执行类型强制检查，可能导致攻击者构造对象负载绕过线程范围并泄露跨租户的检查点数据。

CVSS 6.7 · Medium EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
langchain-ai langgraphjs < 1.3.1 affected
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I. Basic Information for CVE-2026-48121

Vulnerability Information
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Vulnerability Title
@langchain/langgraph-checkpoint-mongodb: NoSQL parameter injection in MongoDBSaver allows cross-tenant state access
Source: CVE Program / CVE List V5
Vulnerability Description
@langchain/langgraph-checkpoint-mongodb provides a LangGraph.js CheckpointSaver implementation that uses MongoDB for storage. Versions 1.3.0 and below are vulnerable to NoSQL injection: checkpoint identifiers (thread_id, checkpoint_ns, checkpoint_id) from config.configurable are passed into MongoDB find() queries in MongoDBSaver.getTuple() without type enforcement. If an attacker supplies an object payload (such as MongoDB operators $gt or $ne) instead of a string, it can be interpreted as a query operator, bypassing thread scoping and leaking checkpoints, including pending writes, across tenants. Applications are at risk if they forward untrusted input into config.configurable without coercing it to strings or validating it against a schema, particularly in multi-tenant or user-isolated setups. Apps that only use server-issued, string-typed identifiers with schema validation rejecting non-string fields are not affected. This issue has been fixed in version 1.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
LangChain LangGraph 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain LangGraph是LangChain公司开源的一个大模型框架。 LangChain LangGraph 1.3.0及之前版本存在输入验证错误漏洞，该漏洞源于未对config.configurable中的检查点标识符执行类型强制检查，可能导致攻击者构造对象负载绕过线程范围并泄露跨租户的检查点数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraphjs < 1.3.1 -

II. Public POCs for CVE-2026-48121

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III. Intelligence Information for CVE-2026-48121

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Patches & Fixes for CVE-2026-48121 (1)

Vendor Advisories for CVE-2026-48121 (1)

Proof of Concept for CVE-2026-48121 (1)

IV. Related Vulnerabilities

Same product: langgraphjs
Same vendor: langchain-ai
Same weakness: CWE-943

V. Comments for CVE-2026-48121

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